 Koppel has composed music for eight ballets for the New Danish Dance Theatre and music for more than 150 movies, 50 theatrical plays and three musicals.He has also composed more than 90 works for classical ensembles, chamber music and 20 concertos, among them two saxophone concertos and four marimba concertos.He played the piano as a child with his father, composer Herman D. Koppel, and later clarinet with several television and concert appearances.